- 10" Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. ...

2 Pack 4 Inch Backdraft Damper Duct, One-Way Airflow Duct Draft Stopper, Inse...

4-Inch Backdraft Damper Shutter Inline Spring Loaded for Dryer Duct

4 Inch Backdraft Damper Back Draft Vent Duct Shutter Blocker, Backflow 4

2 Pack 4 Inch Backdraft Damper Duct, One-Way Airflow Duct Draft Stopper, Inse...

8 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Duct...

2 Pack 4 Inch Backdraft Damper Duct, One-Way Airflow Duct Draft Stopper, Insert

2 Pack 4 Inch Backdraft Damper Duct, One-Way Airflow Duct Draft Stopper, Inse...